Fix format scopes, they should be of type /auth/#{scope}

Scopes should be based on /auth/, no /auth/userinfo.
    
According to https://developers.google.com/+/api/oauth#scopes, valid
scopes are:

    - https://www.googleapis.com/auth/plus.login
    - https://www.googleapis.com/auth/plus.me
    - https://www.googleapis.com/auth/userinfo.email
    
So you should not scopes start with `userinfo.` ...